CN104313216B - Stock level lowering method for iron making blast furnace - Google Patents
Stock level lowering method for iron making blast furnace Download PDFInfo
- Publication number
- CN104313216B CN104313216B CN201410606333.9A CN201410606333A CN104313216B CN 104313216 B CN104313216 B CN 104313216B CN 201410606333 A CN201410606333 A CN 201410606333A CN 104313216 B CN104313216 B CN 104313216B
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- CN
- China
- Prior art keywords
- stockline
- stock level
- fall
- blast furnace
- furnace wall
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a stock level lowering method for an iron making blast furnace. The method comprises the following steps: 1, previous preparation, to be specific, in one week before a stock level is lowered, blowing edge gas flow of coal gas flow in the blast furnace to a furnace wall and flushing to remove iron slag sticking substances unsteadily hung on the furnace wall; and 2, stock level lowering, wherein in the stock level lowering process, the oxygen enrichment use quantity is 2,500 to 3,000m＜3＞/h, the temperature of hot blast is higher than or equal to 1,050 DEG C, the theoretical combustion temperature in the front of a tuyere is higher than or equal to 2,500 DEG C and stock level lowering is finished when the stock level is lowered to the position of the tuyere. The method not only can flush the iron slag sticking substances hung on the furnace wall in the stock level lowering process, but also is safe and rapid.
Description
Technical field
The invention belongs to maintaining blast furnace technical field, relate to the aspect such as medium-capital overhauling blowing out, the furnace wall thick process of knot, specifically
Ground, the present invention is the method for a kind of blast furnace fall stockline.
Background technology
Fall stockline operation is a kind of mode of operation that blast furnace processes that furnace wall dross or blowing out overhaul are conventional.At fall material
Before line operation, in order to maintain conditions of blast furnace direct motion and sufficient heat, when the amount of coke that past blast furnace adds is normally to produce
2 times the highest.In fall stockline operating process, for preventing the working of a furnace from fluctuation occurring, general use stop adding oxygen-enriched,
Reduce hot blast temperature and reduce the theoretical temperature combustion to 2100-2150 DEG C before air port to 800-850 DEG C.This operation
The drawback of mode has: 1) during fall stockline, the coal gas relative temperature toward furnace wall directional spreding is low and coal gas amount is few,
It is unfavorable for washing away the slag ferrum adhesive hanging knot on furnace wall；2) because of in blast furnace local Gas Flow big and wash away on furnace wall
Local slag ferrum adhesive, the slag ferrum adhesive come off pricks bad tuyere small sleeve, sternly because of low can not the fusing in time of temperature
Air port can be made during weight to produce blast.
Summary of the invention
It is an object of the invention to, it is provided that the method for a kind of blast furnace fall stockline, the method is not only able at fall material
Line process washes away and hangs the slag ferrum adhesive tied on furnace wall, and safely, quickly.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows:
The method of a kind of blast furnace fall stockline, said method comprising the steps of:
1) early-stage preparations: starting in the last week at fall stockline, in blast furnace, the edge airflow of Gas Flow blows to furnace wall, punching
Brush away and tie acarpous slag ferrum adhesive except hanging on furnace wall；
2) fall stockline: during fall stockline, oxygen-enriched consumption is 2500-3000m3/ h, hot blast temperature >=1050 DEG C,
Theoretical temperature combustion >=2500 DEG C before air port, are reduced to tuyere position to stockline and terminate to drop stockline.
Preferably, described oxygen-enriched consumption is 2800m3/h。
In the preliminary preparation of the present invention, by parameter adjustment, the mainly adjustment of feeding system, in protection
Under conditions of motive stream, greatly develop edge airflow, wash away to hang on furnace wall and tie acarpous slag ferrum adhesive.
The method applied in the present invention, due to the rising of theoretical temperature combustion so that hangs knot slag ferrum on furnace wall and glues
Knot thing progressively upwardly extends fusing from region, air port.And owing to theoretical tuyere combustion temperature is high, local shedding on furnace wall
Slag ferrum adhesive be melted when reaching region, air port, reduce prick bad tuyere small sleeve risk.
The step do not addressed in the present invention, all can use conventional method.
Comparing with existing technology, the excellent results of the present invention is as follows:
1) due to oxygen-enriched use so that in blast furnace, oxygen concentration raises, and accelerates the burning velocity of coke, shorten
Time of fall stockline；
2) theoretical temperature combustion before air port is brought up to more than 2500 DEG C, the high-temperature region in blast furnace is moved, hang knot and exist
Slag ferrum adhesive on furnace wall has been melted less than air port after coming off, and improves the safety of fall stockline；
3) in blast furnace, high-temperature coal airflow scouring hangs knot adhesive on furnace wall, along with the reduction of stockline, on furnace wall
Adhesive is progressively washed away cleaning by Gas Flow, and after fall stockline, the adhesive on furnace wall is eliminated.
Detailed description of the invention
With detailed description of the invention, the present invention is further detailed explanation below.
Embodiment 1
The Wall of Blast Furnace dross of Shan Gang group Laiwu iron and steel Xinjiang company limited, calculates and learns in blast-furnace shaft middle and lower part
By the annular tumor of 0.6 meter of thickness, the fall stockline method of the present invention is used to carry out dropping stockline.
1) early-stage preparations: starting in the last week at fall stockline, in blast furnace, the edge airflow of Gas Flow blows to furnace wall, punching
Brush away and tie acarpous slag ferrum adhesive except hanging on furnace wall；
2) fall stockline: during fall stockline, oxygen-enriched consumption is 2800m3/ h, hot blast temperature >=1050 DEG C, before air port
Theoretical temperature combustion >=2500 DEG C, to stockline be reduced to tuyere position terminate drop stockline.
After fall stockline terminates, the annular tumor of 0.6 meter of thickness is removed totally substantially, clearance rate 99%.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although
With reference to embodiment, the present invention is described in detail, it will be apparent to an ordinarily skilled person in the art that the present invention
Technical scheme modify or equivalent, without departure from the spirit and scope of technical solution of the present invention, it is equal
Should contain in the middle of scope of the presently claimed invention.
Claims (2)
1. a method for blast furnace fall stockline, said method comprising the steps of:
1) early-stage preparations: starting in the last week at fall stockline, in blast furnace, the edge airflow of Gas Flow blows to furnace wall, punching
Brush away and tie acarpous slag ferrum adhesive except hanging on furnace wall；
2) fall stockline: during fall stockline, oxygen-enriched consumption is 2500-3000m3/ h, hot blast temperature >=1050 DEG C,
Theoretical temperature combustion >=2500 DEG C before air port, are reduced to tuyere position to stockline and terminate to drop stockline.
2. the method for blast furnace fall stockline as claimed in claim 1, it is characterised in that described oxygen-enriched consumption is
2800m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606333.9A CN104313216B (en) | 2014-10-31 | 2014-10-31 | Stock level lowering method for iron making blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606333.9A CN104313216B (en) | 2014-10-31 | 2014-10-31 | Stock level lowering method for iron making blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104313216A CN104313216A (en) | 2015-01-28 |
| CN104313216B true CN104313216B (en) | 2017-01-11 |
Family
ID=52368524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410606333.9A Active CN104313216B (en) | 2014-10-31 | 2014-10-31 | Stock level lowering method for iron making blast furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN104313216B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020082A (en) * | 2019-11-29 | 2020-04-17 | 张家港宏昌钢板有限公司 | Method for online treatment of blast furnace accretion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041332A (en) * | 2010-12-31 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Blowing-out descending stockline control method for blast furnace |
| CN103468839A (en) * | 2013-09-06 | 2013-12-25 | 武汉钢铁(集团)公司 | Method for removing caked slag with thickness not smaller than 500mm from blast furnace body |
-
2014
- 2014-10-31 CN CN201410606333.9A patent/CN104313216B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041332A (en) * | 2010-12-31 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Blowing-out descending stockline control method for blast furnace |
| CN103468839A (en) * | 2013-09-06 | 2013-12-25 | 武汉钢铁(集团)公司 | Method for removing caked slag with thickness not smaller than 500mm from blast furnace body |
Non-Patent Citations (2)
| Title |
|---|
| 《邯钢8号高炉快速停炉降料面实践》;李世杰 等;《炼铁》;20120831;第31卷(第4期);48-50 * |
| 《邯钢917m3高炉停炉实践》;徐俊杰 等;《河北冶金》;20091231(第173期);31-33 * |
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| Publication number | Publication date |
|---|---|
| CN104313216A (en) | 2015-01-28 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Gang Inventor after: Li Peiyan Inventor after: Li Chunlu Inventor after: Liu Weiguo Inventor before: Li Gang |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI GANG TO: LI GANG LI PEIYAN LI CHUNLU LIU WEIGUO |
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| GR01 | Patent grant |